Decides whether a given object is a probability space.
an object for which probability space status should be checked.
It first checks if the class of the object includes
ps, and if so
TRUE is returned. If not, then it checks that the object is a data frame and contains a
probs column. Lastly, it checks whether all entries of
probs are nonnegative. Note that it does not check whether the sum of
probs is one, to allow for the possibility that the input object is a proper subset of a probability space.
G. Jay Kerns firstname.lastname@example.org.
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